Interaction Effects on the Electronic Floquet Spectra: Excitonic Effects

• URL: http://arxiv.org/abs/2505.07428v1
• Date: Mon, 12 May 2025 10:36:54 GMT
• Title: Interaction Effects on the Electronic Floquet Spectra: Excitonic Effects
• Authors: Teng Xiao, Tsan Huang, Changhua Bao, Zhiyuan Sun,
• Abstract summary: We show that excitonic effects, i.e., effects of electron-hole interaction, lead to dramatic corrections to the single-electron Floquet spectra.<n>We compute these effects in phosphorene and monolayer MoS$$ for time-resolved and angle-emission spectroscopy.
• Score: 10.42889951319697
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Floquet engineering of electronic states by light is a central topic in modern experiments. However, the impact of many-body interactions on the single-electron properties remains unclear in this non-equilibrium situation. We propose that interaction effects could be reasonably understood by performing perturbative expansion in both the pump field and the electron-electron interaction when computing physical quantities. As an example, we apply this approach to semiconductors and show analytically that excitonic effects, i.e., effects of electron-hole interaction, lead to dramatic corrections to the single-electron Floquet spectra even when the excitons are only virtually excited by the pump light. We compute these effects in phosphorene and monolayer MoS$_2$ for time- and angle-resolved photoemission spectroscopy (Tr-ARPES) and ultrafast optical experiments.

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